Distributional patterns and conservation planning for a snake assemblage from temperate South America

DI PIETRO D.; CABRERA M. R.; WILLIAMS J.; KACOLIRIRS F; CAJADE R.; ALCALDE, L.

JOURNAL FOR NATURE CONSERVATION

ELSEVIER GMBH

Año: 2018

1617-1381

We analyzed the spatial distribution of a snake assemblage from the Sierras de Ventania mountain range, a richendemism area in east-central Argentina. We used field-collected and museum specimens combined with highresolutionenvironmental variables to identify common distributional patterns, estimate the suitable habitat foreach species, and develop a conservation proposal related to the Protected Natural Areas (PNAs) system.Distributional models diverged into two opposite patterns: suitable habitats for most species at relatively highaltitude in the hills, and suitable habitats for Bothrops ammodytoides and Lygophis anomalus at relatively lowaltitude in the surrounding hill plain. We assessed two proposals based on different conservation algorithms: theadditive benefit function (ABF), which favours hilly environments, prioritizing areas with high specific richness,and the core-area zonation (CAZ), which prioritizes the distribution of all species, further indicating areas withlow richness in the surrounding plain. Regardless of the algorithm used, our results indicated that the existingPNAs are not effective in protecting the snake assemblage. Protecting at least 5% of the highest species richnessareas (ABF) or 5% of the distribution core areas of all species (CAZ), the existing PNAs only represented 2.2% ofthese priority areas. Our findings are largely consistent with previous work, highlighting that a widespread areaneeds to be assigned for conservation purposes. Thus, protection of the snake assemblage should take place bothinside and outside the PNAs.